1. Have you attempted to use the iwconfig GUI in DSL? You can get to it from the DSL menu under "Setup>Net Setup". If that says it can't find the interface, try opening a terminal and typing "iwconfig", if your network card has been identified by DSL, then it shoulld be shown in the list of interfaces presented. Use the name associated with your interface in the "device" box of the iwconfig GUI.

2. Are you using a laptop or desktop PC? Check your BIOS for settings relating to the mouse. I think there is a particular setting that tends to upset the mouse support, but I forgot what it was.

3. I don't think there is a package for Libre, there's a good chance it needs features that aren't available in DSL. There is an old version of Open Office in the MyDSL respository if you need more than the word processor and spreadsheet included with DSL.